The rollercoaster has zero ke because it’s not moving and zero gpe because it’s at its lowest point this is also the start of the rollercoaster. At point one the rollercoaster has zero ke because it’s not moving it has max gpe because it's at its max height. At point 2 the rollercoster has max ke because it is as fast as it can get and has zero gpe because it is as low as it can get. at point three it has half ke and gpe half ke because it is slow and half gpe because it is half way to the top. That is all three of my points.
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